Sodium hexachloroplatinate

The so-called platinum carbonyl readily reacts further with alkali, dissolving to give a series of dianions with general formula [Pt3(CO)6]n2- (n = 6, 5, 4, 3, 2). Each of these dianions can be obtained in a pure state by careful control of the initial OH /Pt(IV) ratio (n = 3, OH-/Pt = 8-9 n = 4, OH-/Pt = 6-6.1 n = 5, OH /Pt = 5.7). However, these ratios are quite critical and the reaction must be followed by IR. If the incorrect product is formed, the desired final product can be obtained by adding further small amounts of alkali or of sodium hexachloroplatinate. 

Under these experimental conditions, it has proved quite difficult to stop the reduction at [Pti8(CO) 0]-". This species has been more conveniently prepared, in the absence of alkali, by oxidation of preformed [Pt16(CO)3o]2- with sodium hexachloroplatinate according to the reaction ... 

It is probable that tetrachloro(diethyIene)diplatinum(II) was first prepared by Zeise by decomposition of trichloro-(ethylene)platinic(II) acid.1 Boiling hexachloroplatinic-(IV) acid with chloroform also gave the compound.2 However, it was first obtained in sufficient quantity for investigation by Anderson,3 who boiled an ethanolic solution of sodium hexachloroplatinate(IV) 6-hydrate until reduction to platinum(II) was complete. This procedure is tedious, and the yields are affected markedly by impurities in the platinum salt and by the presence of other platinum metals.4 Optimum yields of 75% are obtained only after much experience. The general method of Kharasch and Ashford,5 involving adding an olefin to a suspension of platinum(IV) chloride in warm benzene or glacial acetic... 

Sodium hexachloroplatinate also promotes the rearrangement 1 -> 3 in a slow reaction773. 

This, together with [IrCle] " and [IrBre] in ammonium or sodium hexachloroplatinate host lattices, has been well studied 136, 294, 295, 546). The [IrClg] " spectrum (296, 546) is an often-quoted classic since it was the first example of ligand s.h.f.s., proving for the first time that electron delocalization was possible and that the electron spent 30% of its time on the ligands. The g values of the tertiary arsine and phosphine complexes of IrCl4X2 have been measured (358) (see Table XLII). 

Sodium hexachloroplatinate(IV) hexahydrate Na3PtCl3-6H30 16923-68-3 661.873 yel cry llOdec 2.60 63 s FtOH 1 eth... 

The electroplating baths contain a platinum salt such as the so-called P-salt, the hexachloro-platinic add, or the sodium hexachloroplatinate (IV). The electrocatalytic coating consists of platinum and rhodium present in their metallic forms. However, both rhodium and platinum have high chlorine overvoltage (e.g. 300 mV for Rh and 486 mV for Pt at 10 kA.m" ) and exhibit a slight corrosion with the rate depending on the electrolyte and the nature of bath impurities (e.g., CT, F, organics). 

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